In the run up to the first break create a bit of tension with something like this:

For the first instrumental break, use notes from the A Dorian scale. That sounds way more complicated than it is. The A Dorian scale has exactly the same notes as the G major scale. The only difference is the key you’re playing it in.

The end of the first break goes something like this (on a low-G uke):

For the second break concentrate on notes from the A minor pentatonic scale and throw in some of the other notes from A Dorian for a bit of colour.